Oil filter



FIG. 1 is a front perspective view from above of an oil filter, according to the claimed design;

FIG. 2 is a front perspective view from below of the claimed design of FIG. 1;

FIG. 3 is a front view of the claimed design of FIG. 1;

FIG. 4 is a rear view of the claimed design of FIG. 1;

FIG. 5 is a right side view of the claimed design of FIG. 1;

FIG. 6 is a left side view of the claimed design of FIG. 1;

FIG. 7 is a top view of the claimed design of FIG. 1; and,

FIG. 8 is a bottom view of the claimed design of FIG. 1.

The broken lines shown in the drawings depict portions of the oil filter that form no part of the claimed design. 

CLAIM We claim the ornamental design for an oil filter, as shown and described. 